. >> dutch ruppersberger: one of the main reasons we are having this investigation is to educate the citizens in business in the united states of america. in the telecommunications world, once you get the camel's nose in the tent, you can go anywhere. >> kroft: their overriding concern is this-- that the chinese government could exploit huawei's presence on u.s. networks to intercept high-level communications, gather intelligence, wage cyber war, and shut down or disrupt critical services in times of national emergency. >> jim lewis: this is a strategic industry, and it's like aircraft or space launch or computers, i.t. it's a strategic industry in the sense that an opponent can gain serious advantage, can gain serious benefit from being able to exploit the telecommunications network. >> kroft: jim lewis has followed huawei's explosive growth for years from the state department and the commerce department, where his job was to identify foreign technologies that might pose a threat to national security. how did they get so big and so cheap so quickly? >> lewis: two answers. first, ste